feat(add): linkWorkspacePackages + saveWorkspaceProtocol

aube.usage.kdl

@@ -83,6 +83,9 @@ cmd add help="Add a dependency" {
     flag --no-save help="Install without persisting the dependency to `package.json`" {
         long_help "Install without persisting the dependency to `package.json`.\n\nSnapshots `package.json` and the lockfile, links the named packages into `node_modules`, and then restores both files — so the dependency is usable for the current process but the project's committed state is untouched.\n\nHandy for one-off experiments and for scripts that install a tool transiently. Mirrors `pnpm add --no-save`. Conflicts with `-g`/`--global`, which has to persist the install to its global manifest."
     }
+    flag --no-save-workspace-protocol help="Inverse of `--save-workspace-protocol`" {
+        long_help "Inverse of `--save-workspace-protocol`.\n\nForces the manifest specifier into a registry-style spec (`^<version>`) for this invocation, even when `linkWorkspacePackages` matched a local sibling. The install pipeline still prefers the local workspace copy at resolve time — this flag only controls what's written to `package.json`. Mirrors `pnpm add --no-save-workspace-protocol`."
+    }
     flag --save-catalog help="Save the new dependency into the workspace's default catalog" {
         long_help "Save the new dependency into the workspace's default catalog.\n\nWrites `catalog:` into `package.json` and seeds/upserts the resolved range under `catalog:` in the workspace yaml. Mirrors `pnpm add --save-catalog`.\n\nWorkspace and aliased specs (`workspace:*`, `npm:`, `jsr:`) are never catalogized — the manifest gets the original spec and the catalog yaml is left alone. If the package is already in the target catalog, the existing entry is preserved (never overwritten); the manifest then gets `catalog:` only when the existing entry is compatible with the user's range.\n\nConflicts with `--no-save`: catalog mutations write to the workspace yaml, which the `--no-save` restore path doesn't snapshot — combining the two would silently leave an orphaned catalog entry behind."
     }
@@ -93,6 +96,9 @@ cmd add help="Add a dependency" {
     flag --save-peer help="Add as a peer dependency (written to `peerDependencies` in package.json)" {
         long_help "Add as a peer dependency (written to `peerDependencies` in package.json).\n\nBy convention you usually pair this with `--save-dev` so the peer is also installed for local development; that's what pnpm does."
     }
+    flag --save-workspace-protocol help="Force the manifest specifier into `workspace:` form for this invocation, overriding `saveWorkspaceProtocol` from the workspace yaml / `.npmrc` / env" {
+        long_help "Force the manifest specifier into `workspace:` form for this invocation, overriding `saveWorkspaceProtocol` from the workspace yaml / `.npmrc` / env.\n\nOnly meaningful when `linkWorkspacePackages` (or a workspace sibling already exists for the named package). With this flag the entry written to `package.json` is `workspace:^` (rolling) or `workspace:^<version>` (pinned), depending on the resolved `saveWorkspaceProtocol` value."
+    }
     flag "-w --workspace" help="Add the dependency to the workspace root's `package.json`" {
         long_help "Add the dependency to the workspace root's `package.json`.\n\nApplies regardless of the current working directory: walks up from cwd looking for `aube-workspace.yaml`, `pnpm-workspace.yaml`, or a `package.json` with a `workspaces` field and runs the add against that directory."
     }

crates/aube-manifest/src/workspace.rs

@@ -365,6 +365,23 @@ pub struct WorkspaceConfig {
     #[serde(default)]
     pub cleanup_unused_catalogs: Option<bool>,
 
+    // -- Workspace-protocol settings --
+    /// Resolve `aube add <name>` against local workspace siblings
+    /// before falling back to the registry. Wired through
+    /// `aube_settings::resolved::link_workspace_packages`; the typed
+    /// field exists so `meta::workspace_yaml_keys_...` sees the key
+    /// as a real field and doesn't fall through to `extra`.
+    #[serde(default)]
+    pub link_workspace_packages: Option<bool>,
+
+    /// Spec form written to `package.json` when `aube add` matches a
+    /// workspace sibling. The yaml value can be the booleans `true` /
+    /// `false` or the string `"rolling"`, so the typed field lands at
+    /// `yaml_serde::Value` and the resolver normalizes via
+    /// `aube_settings::resolved::SaveWorkspaceProtocol::from_str_normalized`.
+    #[serde(default)]
+    pub save_workspace_protocol: Option<yaml_serde::Value>,
+
     // -- Peer Dependency Settings --
     /// Whether to auto-install peer dependencies (default: true).
     #[serde(default)]

crates/aube-settings/settings.toml

@@ -1985,6 +1985,60 @@ sources.env = ["npm_config_save_prefix", "NPM_CONFIG_SAVE_PREFIX", "AUBE_SAVE_PR
 sources.npmrc = ["save-prefix", "savePrefix"]
 examples = []
 
+[linkWorkspacePackages]
+description = "Resolve `aube add <name>` against local workspace siblings before falling back to the registry."
+type = "bool"
+default = "false"
+docs = """
+When `true` (or `"deep"`), `aube add <name>` (and bare `aube install` for
+unresolved registry deps) checks the workspace for a package whose
+`name` matches the spec. If found, the dep is wired up as a workspace
+link instead of fetched from the registry. The manifest specifier
+written to `package.json` is controlled by `saveWorkspaceProtocol`.
+
+Off by default to match pnpm 8+ — opt in via `pnpm-workspace.yaml`
+when you want every `aube add` to prefer the local copy of a sibling.
+"""
+sources.cli = []
+sources.env = [
+    "npm_config_link_workspace_packages",
+    "NPM_CONFIG_LINK_WORKSPACE_PACKAGES",
+    "AUBE_LINK_WORKSPACE_PACKAGES",
+]
+sources.npmrc = ["link-workspace-packages", "linkWorkspacePackages"]
+sources.workspaceYaml = ["linkWorkspacePackages"]
+examples = []
+
+[saveWorkspaceProtocol]
+description = "Spec form written to `package.json` when `aube add` resolves against a workspace sibling."
+type = '"true" | "false" | "rolling"'
+default = "\"rolling\""
+docs = """
+- `"true"` writes a version-pinned workspace spec (`workspace:^1.0.0`,
+  honoring `savePrefix`). The exact lockfile entry never moves
+  without an explicit `aube update`.
+- `"rolling"` (default) writes the rolling form `workspace:^`
+  (or `workspace:~` / `workspace:*` per `savePrefix`). Sibling
+  version bumps flow into dependents on the next install without
+  re-running `aube add`.
+- `"false"` writes a plain registry-style spec (`^1.0.0`). The dep
+  is still linked locally on install (controlled by
+  `linkWorkspacePackages`), but the manifest looks identical to a
+  registry dep.
+
+The `--save-workspace-protocol` / `--no-save-workspace-protocol` CLI
+flags on `aube add` override this setting per-invocation.
+"""
+sources.cli = []
+sources.env = [
+    "npm_config_save_workspace_protocol",
+    "NPM_CONFIG_SAVE_WORKSPACE_PROTOCOL",
+    "AUBE_SAVE_WORKSPACE_PROTOCOL",
+]
+sources.npmrc = ["save-workspace-protocol", "saveWorkspaceProtocol"]
+sources.workspaceYaml = ["saveWorkspaceProtocol"]
+examples = []
+
 [tag]
 description = "Default dist-tag used by `aube add` without a version."
 type = "string"